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Nedoseikina, T. I.
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article
Cobalt-containing core-shell nanoparticles on the surface of poly(tetrafluoroethylene) microgranules
Abstract
<p>Cobalt-containing nanoparticles have been prepared via thermal decomposition of cobalt acetate on the surface of poly(tetrafluoroethylene) (PTFE) microgranules forming a fluidized bed over the surface of hot mineral oil. Using transmission electron microscopy, the average size of the cobalt-containing nanoparticles has been determined to be 3.6 nm. The composition and structure of the nanoparticles have been determined by x-ray diffraction, extended x-ray absorption fine structure spectroscopy, and electron paramagnetic resonance, and the magnetic properties of the synthesized nanomaterial have been studied. The results indicate that the nanoparticles have a core-shell structure, with a metallic cobalt core (≲ 10 vol%) and a shell consisting of three phases: Co <sub>3</sub>O <sub>4</sub> (≲ 80%) and small amounts of CoO and CoF <sub>2</sub> (≲ 10%). The fluoride phase results from the interaction of the nanoparticles with surface fluorine atoms of the PTFE microgranules.</p>